Datasheet

DocID026284 Rev 4 33/128
STM32F091xB STM32F091xC Pinouts and pin descriptions
40
Figure 9. UFQFPN48 package pinout
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Table 12. Legend/abbreviations used in the pinout table
Name Abbreviation Definition
Pin name
Unless otherwise specified in brackets below the pin name, the pin function during and
after reset is the same as the actual pin name
Pin type
S Supply pin
I/O Input / output pin
I/O structure
FT 5 V-tolerant I/O
FTf 5 V-tolerant I/O, FM+ capable
TTa 3.3 V-tolerant I/O directly connected to ADC
TC Standard 3.3 V I/O
RST Bidirectional reset pin with embedded weak pull-up resistor
Notes
Unless otherwise specified by a note, all I/Os are set as floating inputs during and after
reset.
Pin
functions
Alternate
functions
Functions selected through GPIOx_AFR registers
Additional
functions
Functions directly selected/enabled through peripheral registers
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